I guess-my personal experience-that the most important in the beginning is not performance, just the taste- the best e-liquid. This opens the gates..
I've started with prefilled cartomizers from Vapor4Life, and the taste that I will never forget (VG Cherry, I guess) was exactlly what motivates my to go on and on..It means that he must try many, many tastes( PG or VG), and in a point he could discover an entire different univers of tastes.. a kind of re-born.. a different world..